Hongnuo (shenyang) General Machinery Co., Ltd. is one of the most reliable manufacturers and suppliers of electronic water flow switch in China. Welcome to buy high quality electronic water flow switch at competitive price from our factory. We also accept customized orders.

The HNF10-A Compact Electronic Flow Switch provides a reliable, cost-effective solution for monitoring flow presence/absence in water and oil pipelines. Its electronic sensing principle ensures fast response, long service life, and no moving parts to clog or wear, making it an ideal upgrade from traditional mechanical baffle switches.

Designed for easy integration, this switch features a fully waterproof IP67 stainless steel housing (304 body, 316L probe), compact size, and low flow resistance. It offers clear visual status indication via LED lights (green for flow, red for no-flow) and supports both PNP and NPN output signals for direct PLC interfacing. A key enhancement is the built-in potentiometer, allowing on-site sensitivity adjustment to fine-tune the trigger point for varying media viscosities or flow conditions, eliminating the need for factory recalibration.

With a wide operating temperature range (-10℃ to 60℃), pressure resistance up to 1.6MPa, and thread connections (G1/2" or G1/4"), the HNF10-A is versatile and durable. It is suitable for pipe diameters from DN8 to DN300 (with different probe options) and consumes minimal power (2W at 24VDC). Ideal for industries such as water treatment, machine tool cooling, semiconductor manufacturing, food & pharmaceutical processing, and environmental protection equipment, this electronic flow switch combines economical pricing, rugged construction, user-adjustable sensitivity, and easy plug-in installation for reliable flow monitoring in diverse applications.

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HNF10-A Thermal Flow Switch
Specific Parameters	Value / Description
Measurement Principle	Thermal flow switches typically include a heating element and at least one temperature sensor (or use the heating element as a temperature detection element as well). Their operation relies on the cooling effect of fluid flow on heat: No flow: The heat generated by the heating element is mainly dispersed through natural convection and conduction, causing the temperature detected by the sensor to be higher. With flow: The flowing fluid accelerates the loss of heat, causing the sensor temperature to drop. The greater the flow, the faster the heat dissipation, and the more pronounced the temperature change. By detecting temperature or heat changes, it can be determined whether the fluid is flowing or if the flow has reached a set threshold.
Nominal Diameter Range	Thread G1/2", G1/4", others customizable
Wetted Parts Material	316L
Connection Method	Threaded Connection
Maximum Measurement Error
Measurement Range	0.3-0.5 meters per second
Maximum Process Pressure	1.6MPa
Medium Temperature Range	-10°C to 80°C
Ambient Temperature Range	-10°C to 80°C
Transmitter Housing Material	Unrestricted
Display/Operation	No display
Inputs
Outputs	NPN PNP
Power Supply	24VDC 2W
Certificate
Functional Safety	Functional safety follows the IEC 61508 standard, allowing its use in safety applications as stipulated by the IEC 61511 standard.
Ordering Information

Electronic Water Flow Switch